Use WAD to move, do not touch spikes/lava. Green makes you jump higher. When touching ladders, press SPACE to go up. S to skip level and P to go to previous level. R to restart/self kill. There are 10 levels in total.
No advertising pls. Tutorial from @SammyCheez Link to video tutorial: https://www.youtube.com/watch?v=wQk_icD3s7o Music from Scratch